煤炭行业是美国能源独立的支柱,已经持续了几代人。
When you have a good research design, the data can speak for itself.
Every book is a new adventure in making.
诗人是打破沉默的人,是第一个说话的人,是敢于说话的人。
Innovation is not just about technology; it's about changing the way people think and act.